To support unicode-range descriptor for webfonts, font matching under Linux now uses the same font matching code as other platforms

Firefox uses a SHA-256 signing certificate for Windows builds as recommended by Microsoft.

Developer Changes

Allow about:pages to load remote content.

Size restrictions for extension icons to prevent too large toolbar icons from deforming the toolbar.

MediaStream.stop() has been deprecated, MediaStream.addTrack()/removeTrack() have been added.

Visual tools for Animation and Layout & Styles have been improved.

WebRTC interfaces have been unprefixed: in particular mozRTCPeerConnection is now RTCPeerConnection, mozRTCIceCandidate is now RTCIceCandidate, and mozRTCSessionDescription is now RTCSessionDescription.

Firefox per Android

Support added for urls with the mms protocol (multimedia messaging service).